发明申请
- 专利标题： INSTRUCTION SET EXTENSION USING 3-BYTE ESCAPE OPCODE
- 专利标题（中）： 使用3字节ESCAPE操作码的指令集扩展
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申请号： US12039719申请日： 2008-02-28
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公开(公告)号： US20080148019A1公开(公告)日： 2008-06-19
- 发明人: James S. Coke , Peter J. Ruscito , Masood Tahir , David B. Jackson , Ves A. Naydenov , Scott D. Rodgers , Bret L. Toll , Frank Binns
- 申请人： James S. Coke , Peter J. Ruscito , Masood Tahir , David B. Jackson , Ves A. Naydenov , Scott D. Rodgers , Bret L. Toll , Frank Binns
- 主分类号： G06F9/30
- IPC分类号： G06F9/30
摘要：
A method, apparatus and system are disclosed for decoding an instruction in a variable-length instruction set. The instruction is one of a set of new types of instructions that uses a new escape code value, which is two bytes in length, to indicate that a third opcode byte includes the instruction-specific opcode for a new instruction. The new instructions are defined such the length of each instruction in the opcode map for one of the new escape opcode values may be determined using the same set of inputs, where each of the inputs is relevant to determining the length of each instruction in the new opcode map. For at least one embodiment, the length of one of the new instructions is determined without evaluating the instruction-specific opcode.
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